KR101240221B1 - Optical sheet laminating method, optical sheet laminating device and program used therewith, and display device - Google Patents

Abstract

To provide a laminating method that achieves high accuracy and high quality in the laminating step of optical sheet and display panel. Contact areas between the optical sheet and the sheet holding head are read. At this time, the optical element face of the optical sheet is brought into contact with the sheet holding head, and light is irradiated to the contact areas between the optical element face and the sheet holding head from the non-optical element face, based on the distribution of the reflected light. The positional information of the optical sheet is read out.

Description

OPTICAL SHEET LAMINATING METHOD, OPTICAL SHEET LAMINATING DEVICE AND PROGRAM USED THEREWITH, AND DISPLAY DEVICE}

Cross Reference of Related Application

This application is based on and claims priority for Japanese Patent Application No. 2010-150067, filed June 30, 2010, the disclosure of which is incorporated herein by reference in its entirety.

1. Technical Field of the Invention

The present invention relates to an optical sheet laminating method, an optical sheet laminating device, a display device and the like for laminating an optical sheet on a display panel.

In accordance with the demand for the very sophisticated functions of recent display devices, an optical sheet, such as a lenticular lens sheet, a prism sheet, or a diffusion sheet, is laminated onto a display panel using electro-optic elements such as liquid crystals. Therefore, a unique display device capable of three-dimensional imaging, viewing angle control, and the like has been used.

As an example of such a display device, a display device using a lenticular lens sheet will be described. FIG. 21A is a perspective view showing a lenticular lens sheet, and FIG. 21B is a schematic diagram showing a three-dimensional display device using the lenticular lens sheet.

As shown in FIG. 21A, the lenticular lens sheet 110 has a flat surface on one of the surfaces and a plurality of cylindrical lenses 111 each having a columnar surface, which is semicircular (approximately segmented). The cross-sectional shape is repeatedly provided in parallel on the other surface.

As shown in FIG. 21B, the left-eye pixel 115a and the right-eye pixel 115b are alternately disposed on the display panel 114 by corresponding to the focal points of each of the cylindrical lenses 111. When the left-eye pixel 115a and the right-eye pixel 115b are driven by a drive circuit not shown in accordance with the defined signals, the left-eye image is left by the cylindrical lenses 111, respectively. It is formed in the inner region 120a, and the right-eye image is formed in the right-eye region 120b, so that the viewer can recognize the stereoscopic image. A typical two-dimensional image can also be displayed via driving the left-eye pixel 115a and the right-eye pixel 115b by the same signal.

There is also a multi-image simultaneous display device that displays a plurality of images simultaneously, such as a display device using a lenticular lens sheet. This uses the same method of stereoscopic display in which different images can be displayed to a plurality of observers by distributing the images in the viewing direction by the cylindrical lenses.

In such a display device using a micro lens array and a lenticular lens sheet, a lenticular lens sheet or the like is mounted on a display panel with high accuracy in order to obtain a high-quality stereoscopic image display or a multi-image simultaneous display ( mount). In particular, for high-definition display devices recently loaded in terminal devices and the like, it is necessary to achieve lamination with higher accuracy than before, which is lamination accuracy on the order of μm.

In order to laminate an optical sheet, such as a lenticular lens sheet, on a display panel with high accuracy, the optical sheet and through the execution of the alignment action by providing a position alignment mark on each of the optical sheet and the display panel and reading these marks and It is necessary to laminate the display panel. In the following, this technique will be referred to as "related technique 1".

In related art 1, it is necessary to form respective marks on the optical sheet and the display panel on the order of μm in order to achieve lamination accuracy on the order of μm. For example, the distance of the mark on the lenticular lens sheet from the vertex of the cylindrical lens needs to be accurate to about 占 퐉. However, in general, it is difficult to form the mark accurately on the order of µm when manufacturing the optical sheet by mechanical operation. On the other hand, another lens mark reading method is disclosed in Japanese Patent Laid-Open No. 2009-223193 (Patent Document 1: Figs. 3 and 8). Hereinafter, this technique is referred to as "related technique 2". In related art 2, although no special mark is formed on the lenticular lens sheet, light is irradiated onto the lenticular lens sheet and the positional information of the cylindrical lens is derived from the transmission light luminance distribution generated according to the lens image forming performance. Is read. In the display panel, the panel mark is captured through the cylindrical lens and the positions are aligned based on it.

In addition, Japanese Patent Laid-Open No. 2009-222903 (see Patent Document 2: Fig. 39) discloses steps for laminating an optical element array sheet on a display panel by using a curve-shaped optical element holding head.

However, using related technique 1, the following issues exist. The optical sheet mark is located on the surface of the optical sheet, and the panel mark is located on the surface of the display panel. For example, if the marks on both the optical sheet and the display panel overlap each other, the image is captured by the camera, each mark is read from the image, and the distances to both marks from the camera are different. This makes it difficult to align the focus at the same time using both marks. This causes a problem in reading the marks.

Referring to the case of the liquid crystal display device as an exemplary manner as shown in FIG. 22A, a panel mark 132 is formed on the driving substrate 152 or the counter substrate 153, and the optical sheet 151 is formed on the optical sheet 151. The sheet mark 150 is formed. Thus, because there is a counter substrate 153, a polarizer 154, and an optical sheet 151 present therebetween, the optical sheet mark 150 and the panel mark 132 are captured when capturing the images by the same camera. It is necessary to align the focus individually. In other words, the reading accuracy of both marks depends on the feeding accuracy of the focusing direction of the camera. It is also disadvantageous from a tactical point of view because it takes a lot of time to align the focus.

Also, because of the structure for reading the panel mark 132 through the optical sheet 151, the position of the panel mark 132 is observed by changing due to the refractive effect of the optical sheet 151. Therefore, it is necessary to perform the correction. In addition, the brightness distribution of the transmitted light obtained by irradiating light onto the optical sheet 151 greatly depends on the image forming performance of the cylindrical lens. However, if there are many deformations in the radial curvature of each of the lenses, or if there is distortion generated in the optical sheet 151 itself, for example, the brightness distribution varies non-uniformly in the surface. This results in deterioration of mark reading accuracy.

In addition, while the optical sheet mark 150 and the panel mark 132 overlap each other, the panel mark 132 is disposed directly below the optical sheet 151. For example, using a liquid crystal display device as shown in FIG. 22B, the external shape of the optical sheet 151 is one size smaller than the external shape of the display panel 131 and the external shape of the polarizing plate 154. Thus, "the panel mark 132 comes directly under the optical sheet 151" means that the panel mark 132 is disposed near the display area 155 of the display panel 131. In particular, using a conventional white liquid crystal display device, a panel mark 132 that causes light leakage (shield of light) is formed near the display area 155. Thus, there are many impacts imposed on display quality.

In addition to these issues of related art 1, a new issue is known as a result of the studies conducted by the inventors of the present invention regarding the steps for laminating a very accurate and very reliable lens and display panel. For example, using a lenticular lens sheet as one of the optical lens sheets, there may be a case where the lens pitch becomes non-uniform within the surface mainly due to the manufacturing process of the lenticular lens sheet, as shown in FIG. 23. For example, when the lens pitch becomes uneven, for example, when the lens pitch becomes larger toward the upper side as in FIG. 23A, when the lens pitch becomes larger toward the center as in FIG. 23B, and as in FIG. 23C Likewise, there are various patterns when the lens pitch becomes smaller toward the center. This nonuniformity of the lens pitch greatly influences the visually perceivable distance at which the three-dimensional viewing field becomes the largest and the size itself of the three-dimensional viewing field of the three-dimensional display device. Therefore, it is necessary to reduce the influence of lens pitch variation when laminating the optical sheet.

Further, when holding the optical element forming surface of the optical sheet by using the sheet holding head, the substantial contact area between the optical sheet and the sheet holding head becomes small because the optical element forming surface has fine protrusions and recesses. For this reason, such an issue exists that the force for holding the optical sheet is reduced.

On the other hand, the related art 1 reads the positional information of the optical sheet mark by using the presence of the light transmitted through the optical sheet, while the related art 2 reads the positional information of the lens by using the brightness distribution of the light transmitted through the optical sheet. do. That is, the related art 2 obtains the positional information by using the light transmitting through the optical sheet as in the case of the related art 1, so the related art 2 faces the same issue. Further, the sheet holding head (holding frame for holding the lenticular lens sheet) of the related art 2 is formed of a material showing light transmitting properties in order not to interfere with the imaging performed by the imaging section (see paragraph 0022 of Patent Document 2). Therefore, the materials used for the seat holding head of related art 2 are limited to brittle glass, plastic, and the like, so that solid metals, ceramics, and the like cannot be used.

The present invention is designed to overcome these issues. An exemplary object of the present invention is to provide an optical sheet laminating method and a method for mounting an optical sheet on a display panel having a high yield and high accuracy as well as providing a high quality display device manufactured by using the laminating method. It is to provide a laminating device to be used.

An optical sheet laminating method according to an exemplary aspect of the present invention is directed to an optical sheet and display panel having two sides composed of an optical element surface on which a plurality of optical elements are formed and a non-optical element surface on which the optical elements are not formed. A method of laminating by using a holding head, the method comprising: bringing either an optical element face or a non-optical element face into contact with a sheet holding head; Irradiating light from the other of the optical element face and the non-optical element face with a contact area between either the optical element face or the non-optical element face and the sheet holding head; Reading positional information of the contact area from the reflected light distribution; And aligning the position of the optical sheet and the position of the display panel based on the position information of the contact area, and laminating the optical sheet and the display panel.

An optical sheet laminating device according to another exemplary aspect of the present invention is a laminating optical sheet and display panel having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which the optical elements are not formed. A device comprising: a sheet holding head for holding an optical sheet by bringing it into contact with either the optical element face or the non-optical element face; Contacting areas between the optical element face or the non-optical element face and the sheet holding head, irradiating light from the other of the optical element face and the non-optical element face, and obtaining an image of the reflected light. 1 imaging unit; A second imaging unit which acquires an image of a panel mark added to the display panel; A moving mechanism unit for moving at least one of the optical sheet and the display panel in the coordinate space; And reading the position information of the contact regions from the image acquired by the first imaging unit and the position information of the panel mark from the image acquired by the second imaging unit, and based on the position information of the contact regions and the position information of the panel mark. Thereby controlling the moving mechanism unit to align the position of the optical sheet and the position of the display panel and to laminate the optical sheet and the display panel.

A display device according to another exemplary aspect of the invention is characterized in that it comprises a display panel in which the optical sheet is laminated by the optical sheet laminating method of the invention.

1 shows a schematic diagram illustrating a laminating method according to a first exemplary embodiment.
2 is a chart showing steps of a laminating method according to the first exemplary embodiment.
3 is a schematic diagram illustrating a laminating device according to the first exemplary embodiment.
4A is a block diagram illustrating a laminating device according to the first exemplary embodiment, and FIG. 4B is a block diagram illustrating an example of the control unit shown in FIG. 4A.
5 is a graph showing an alignment action of the laminating device according to the first exemplary embodiment.
6 is an image and a side view showing a contact area between an optical element face and a sheet holding head of an optical sheet according to a first exemplary embodiment.
7A is another example of an image showing the contact area between the optical element face of the optical sheet and the sheet holding head according to the first exemplary embodiment, and FIG. 7B shows the contact between the sheet holding head and the non-optical element face of the optical sheet. It is a side view which shows the state to become.
8A-8C show another example of the first exemplary embodiment, where FIG. 8A is a schematic diagram when reading position information of an optical sheet by a plurality of cameras, and FIG. 8B is a sheet when laminating an optical sheet. 8C is a schematic diagram showing a holding head, and FIG. 8C is a schematic diagram showing a case where a sheet holding head is provided on the lower side of the display panel.
9A-9C show a seat holding head according to a second exemplary embodiment, where FIG. 9A is a perspective view, and FIGS. 9B and 9C are schematic diagrams showing a position information reading action.
10A-10C are schematic diagrams illustrating laminating steps according to the second exemplary embodiment, wherein the steps proceed in the order of FIGS. 10A, 10B, and 10C.
11A and 11B show perspective views of a part of the laminating step according to the second exemplary embodiment, wherein FIG. 11A is a case where the contact area between the sheet holding head and the optical sheet is parallel to the arc tangent direction of the sheet holding head. 11B is a case where the contact area between the sheet holding head and the optical sheet is perpendicular to the arc tangent direction of the sheet holding head.
12 is a schematic diagram illustrating a case where a seat holding head according to the second exemplary embodiment is provided on the lower side of the display panel.
13 is a graph showing an example of the relationship between the laminating pressure and the amount of lens pitch variation before and after lamination according to the second exemplary embodiment.
14A is a plan view showing lenticular lenses at non-uniform lens pitches according to the third exemplary embodiment, FIG. 14B is a graph showing a relationship between laminating pressure and lens pitch variation, and FIG. 14C is a laminating pressure at an appropriate value. Graph showing what is being set.
FIG. 15A is a plan view illustrating another example of lenticular lenses at non-uniform lens pitches according to the third exemplary embodiment, FIG. 15B is a first graph showing that laminating pressure is set to an appropriate value, and FIG. 15C is laminating A second graph showing that the pressure is set to an appropriate value.
FIG. 16A is an image and a side view showing a contact area between an optical element face of the optical sheet shown in FIG. 16B and a sheet holding head, and FIG. 16B is a perspective view showing a first optical sheet according to a fourth exemplary embodiment.
FIG. 17A is an image and side view showing a contact area between the optical element face of the optical sheet shown in FIG. 17B and the sheet holding head, and FIG. 17B is a perspective view showing a second optical sheet according to the fourth exemplary embodiment.
18A is a plan view showing a third optical sheet according to the fourth exemplary embodiment, and FIG. 18B is an image showing a contact area between the optical element face and the sheet holding head of the optical sheet shown in FIG. 18A.
19A is a perspective view showing a mobile terminal device loaded with a display device having an optical sheet laminated on a display panel by using the present invention, and FIG. 19B is a perspective view showing a fly-eye lens as an optical sheet; to be.
20 is a plan view showing a display panel and a panel mark of the present invention.
FIG. 21A is a perspective view showing a lenticular lens sheet, and FIG. 21B is a schematic diagram showing a three-dimensional display method using the lenticular lens sheet.
22A is a side view illustrating the liquid crystal display device, and FIG. 22B is a plan view illustrating the liquid crystal display device.
23A-23C show the case where the lens pitches become non-uniform within the surface of the lenticular lens sheet, where FIG. 23A is the case where the lens pitch becomes larger toward the upper side, and FIG. 23B is the case where the lens pitch becomes larger toward the center 23C is a case where the lens pitch becomes smaller toward the center.

Modes for implementing the present invention (hereinafter referred to as "exemplary embodiments") will now be described with reference to the accompanying drawings. In the present description and drawings, the same reference numerals apply to substantially the same structural elements.

(First Exemplary Embodiment)

In the first exemplary embodiment, the case of using a lenticular lens sheet formed of a plurality of cylindrical lenses as an optical sheet will be described. Descriptions are provided by referring to the case where the lenticular lens sheet is used as the optical sheet, but in another exemplary embodiment, the present invention is not limited to this only. Optical element arrays may also be used, including prismatic sheets, reflective sheets, diffuser sheets, and the like, having defined patterns formed thereon.

1 is a schematic diagram illustrating a laminating method according to the first exemplary embodiment, and FIG. 2 is a chart showing steps of the laminating method according to the first exemplary embodiment. Hereinafter, explanations will be provided by referring to FIGS. 1 and 2.

The optical sheet laminating method according to the first exemplary embodiment is for laminating the optical sheet 10 on the display panel 30 by using the sheet holding head 20. The optical sheet 10 is a lenticular lens sheet formed of a plurality of cylindrical lenses 11 as a plurality of optical elements, the optical sheet 10 is an optical element surface 12 on which the cylindrical lenses 11 are formed, And a non-optical element face 13 on which no cylindrical lenses 11 are formed. In other words, the optical element face 12 is a concave-convex face and the non-optical element face 13 is a flat face. In addition, the laminating method according to the first exemplary embodiment includes the following steps.

Steps 101-103 (FIGS. 1A and 1B): the optical element face 12 is brought into contact with the sheet holding head 20 (step 101), and the optical element face 12 from the non-optical element face 13. Light 41 is irradiated into the contact regions 14 between the sheet holding head 20 and step 102, and the positional information of the contact regions 14 is read from the distribution of the reflected light 42. (Step 103). In steps 102 and 103, for example, a first imaging section 40 having a light source 43 and a camera 44 is used. Steps 101-103 may be executed in any order as long as the location information of the contact regions 14 can eventually be read. For example, steps 101-103 may be executed in this order, or they may all be executed simultaneously. Furthermore, the non-optical element face 13 is brought into contact with the sheet holding head 20, and from the optical element face 12 to the contact areas between the non-optical element face 13 and the sheet holding head 20. It is possible to irradiate the light 41 and to read the positional information from the distribution of the reflected light 42.

Step 104 (FIG. 1C): The positional information of the panel mark 31 applied on the display panel 30 is read. In step 104, for example, a second imaging section 50 having a light source 53 and a camera 54 is used. For example, the imaging unit 50 irradiates the light 51 with the panel mark 31 applied on the display panel 30, and the positional information of the panel mark 31 is read from the transmitted light 52. . Step 104 may be performed before or after steps 101-103 in terms of time. If the positional information of the panel mark 31 is already known, step 104 may be omitted.

Step 105 (FIG. 1D): The position of the optical sheet 10 and the position of the display panel 30 are aligned based on the positional information of the contact regions 14 and the positional information of the panel mark 31. Conventional alignment techniques may be used for this position alignment.

Step 106 (FIG. 1D): The optical sheet 10 and the display panel 30 are laminated. For example, the optical sheet 10 and the display panel 30 are laminated by relatively moving the optical sheet 10 and the display panel 30 while maintaining the contact of the optical sheet 10 and the display panel 30. . Relatively moving the optical sheet 10 and the display panel 30 is to move at least one of the optical sheet 10 and the display panel 30. Conventional laminating techniques can be used for this lamination.

The first exemplary embodiment uses reflected light 42 rather than transmitted light to read the positional information of the optical sheet 10. Therefore, various issues in the case of using the transmitted light can be overcome with one effort, so that the reading accuracy of the positional information of the optical sheet 10 can be improved. This makes it possible to achieve high accuracy and improve yield in the optical sheet laminating step.

3 is a schematic diagram illustrating a laminating device of the first exemplary embodiment. 4A is a block diagram illustrating a laminating device of the first exemplary embodiment. 4B is a block diagram illustrating an example of the control unit shown in FIG. 4A. 5 is a graph showing an example of an alignment action performed by the laminating device of the first exemplary embodiment. Hereinafter, explanations will be provided by referring to FIGS. 3, 4, and 5.

The optical sheet laminating device 60 of the first exemplary embodiment is a method of laminating the optical sheet 10 on the display panel 30 by using the optical sheet laminating method according to the first exemplary embodiment, which device 60 includes a seat holding head 20, a first imaging portion 40, a second imaging portion 50, a movement mechanism unit 70, and a control unit 80. The sheet holding head 20 holds the optical sheet 10 by contacting with the optical element face 12. The imaging section 40 irradiates the light 41 from the non-optical element face 13 to the contact regions 14 between the optical element face 12 and the sheet holding head 20, and the reflected light 42. Obtain an image 45 of the distribution of. The imaging unit 50 acquires an image 55 of the panel mark 31 applied on the display panel 30. The moving mechanism unit 70 moves the optical sheet 10 and the display panel 30 in the coordinate space. The control unit 80 not only displays the positional information of the contact regions 14 from the image 45 obtained by the imaging unit 40, but also the panel mark 31 from the image 55 acquired by the imaging unit 50. Of the optical sheet 10 and the display panel 30 by controlling the moving mechanism unit 70 based on the position information of the panel mark 31 and the position information of the contact regions 14. The position is aligned, and the optical sheet 10 and the display panel 30 are laminated.

The moving mechanism unit 70 includes an optical sheet side mechanism 71 and a display panel side mechanism 74. The optical sheet side mechanism 71 is formed of, for example, a linear motor mechanism (or stepping motor and screw feed mechanism), a rotary mechanism, and the like. The optical sheet side mechanism is divided into a fixed main body 72 and a head stage 73 which is movable relative to the main body 72. The head stage 73 can linearly move the seat holding head 20 in the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively, and can rotate in the θ direction about the Z-axis direction. . The display panel side mechanism 74 is formed of, for example, a linear motor mechanism (or a stepping motor and a screw feed mechanism) and the like and is movable with respect to the fixed main body 75 and the main body 75. Divided into. The panel stage 76 may load the display panel 30 thereon, and may linearly move in the X-axis direction and the Y-axis direction, respectively. The head stage 73 and the panel stage 76 only need to move relatively. Thus, movement in the Z-axis direction and rotation in the θ direction may be assigned to the panel stage 76, and movement in the Y-axis direction, for example, during the head stage 73 or the panel stage 76. It may only be assigned to either. In addition, the movement mechanism unit 70 may move either the optical sheet 10 or the display panel 30 in the coordinate space. In this case, either the optical sheet side mechanism 71 or the display side mechanism 74 may be omitted.

The control unit 80 includes, for example, a conventional computer formed of a CPU 81, a ROM 82, a RAM 83, an input / output interface 84, and the like, and operates according to a computer program and data. . The control unit 80 receives the images 45 and 55 from the imaging units 40 and 50, and reads the positional information of the panel mark 31 and the positional information of the contact regions 14 by an image processing program or the like. And control signals 85, 86, 87 based on this information are output to the sheet holding head 20, the optical sheet side mechanism 71, and the display panel side mechanism 74, respectively. The control signal 85 includes a signal instructing the sheet holding head 20 to start or end the holding action of the optical sheet 10. The control signal 86 includes a signal for moving the head stage 73 (ie, the optical sheet 10) to defined coordinates. Control signal 87 includes a signal for moving display panel side mechanism 74 (ie, display panel 30) to defined coordinates. Examples of computer programs of the control unit 80 include a procedure for causing a computer to read the positional information of the contact area 14 from the image 45 obtained by the imaging unit 40, the imaging unit 50. Procedure for reading the position information of the panel mark 31 from the image 55 obtained by the position, and the position of the panel mark 31 to align the position of the optical sheet 10 and the position of the optical display panel 30. It may be a program to control the moving mechanism unit 70 based on the information and the positional information of the contact area 14 and to execute a procedure for laminating the optical sheet 10 and the display panel 30.

= 0) 그러한 방식으로 제어된다.Now, an example of an alignment action performed by the laminating device 60 will be described. First, the position, magnification, etc. of the cameras 44 and 54 are adjusted in such a manner that the pixels of the cameras 44 and 54 correspond one-to-one based on coordinates on the XY plane. In addition, as shown in Fig. 5, the positional information of the contact regions 14 is obtained as Ma1 (xa1, ya1), Ma2 (xa2, ya2), and the positional information of the panel mark 31 is Mb1 (xb1, yb1), Mb2 (xb2, yb2) is assumed to be obtained. Ma1 and Ma2 are defined as the coordinates of the vertices of both ends of the particular single cylindrical lens 11. Mb1, Mb2 are defined as the coordinates of two cross-shaped panel marks 31. At this time, the movement mechanism unit 70 has the center Mao of the straight line Ma connecting the point Ma1 and the point Ma2 and the straight line Mb connecting the point Mb1 and the point Mb2 match each other, and the slope of the straight line Ma and the slope of the straight line Mb are Match each other (ie

= 0) controlled in such a way.

Next, the first exemplary embodiment will be described in more detail.

Optical sheets 10, such as lenticular lenses, are used in display devices that provide image display towards a plurality of viewpoints. The optical sheet 10 is adjacent to the display surface of the display panel 30 and transmits at least some of the light wavelengths in the visible light region. There is no restriction set for the material of the optical sheet 10, and any material, whether non-organic material or organic material, may be used as long as it is a material transmitting at least a part of light having a wavelength of 400 nm-800 nm. Glass or the like can be used as the non-organic material, and plastic or the like can be used as the organic material. In general, however, plastic is often used. As the plastic, engineering plastics such as polymethylmethacrylate (PMMA), cyclopolyolefin (COP), polycarbonate (PC) and the like can be used. There is no specific limitation set on the thickness of the optical sheet 10. However, in plastic use it is preferably in the range of about 0.05 mm to 0.5 mm.

1 shows a schematic diagram of an example of an optical sheet laminating step according to a first exemplary embodiment. First, as shown in FIG. 1A, the optical sheet is held by using the sheet holding head 20. Then, as shown in FIG. 1B, light 41 is irradiated from the light source 43 toward the contact regions 14, and the distribution of the reflected light 42 is captured by the camera 44. The positional information of the optical sheet 10 is read by using the acquired image 45. At the same time, as shown in FIG. 1C, the positional information of the panel mark 31 (see FIG. 20) on the display panel 30 is read by using the camera 54. Thereafter, as shown in FIG. 1D, the sheet holding head 20 and the display panel that hold the optical sheet 10 based on the two positional information for laminating the optical sheet 10 and the display panel 30. An alignment action for aligning the panel stage 76 (see Fig. 3) that fixes the 30 to the defined position.

Although the panel mark 31 (see FIG. 20) is read out in accordance with the transmitted light 52, it is also possible to read the panel mark using the reflected light when the material constituting the panel mark has a defined reflective characteristic. . In addition, various actions may be used as the alignment action. For example, when the sheet holding head 20 is movable to an arbitrary position and the panel stage 76 (see FIG. 3) is fixed, the panel stage 76 is movable to an arbitrary position and the sheet holding head ( When 20) is fixed, it is possible to use the case where both the sheet holding head 20 and the panel stage 76 are movable to an arbitrary position.

6 is an image and a side view showing a contact area between an optical element face and a sheet holding head of an optical sheet according to a first exemplary embodiment. 7A is another example of an image showing a contact area between an optical element face and a sheet holding head of an optical sheet according to the first exemplary embodiment, and FIG. 7B shows a contact between the non-optical element face of the optical sheet and the sheet holding head. It is a side view which shows the state to make. Hereinafter, explanations will be provided by referring to FIGS. 1, 6, and 7.

6 shows that the contact area 14 between the optical element face (lens face) 12 of the optical sheet (lenticular lens sheet) 10 and the sheet holding head 20 is captured by using the reflected light 42. The image 45 of the case is shown. The vertices of the cylindrical lenses 11 forming the lenticular lens sheet and the seat holding head 20 are in linear contact with each other, and the plurality of contact regions 14 periodically follow the period of the cylindrical lenses 11. Is formed. When light 41 is irradiated to these contact regions 14, the light is strongly reflected at the contact regions 14. Thus, as in the case of related art 2 (see FIG. 8 of Patent Document 1), an image 45 is obtained at a larger contrast as shown in FIG. 6 compared to the case where the lenticular lens sheet is captured by transmitted light. It is possible to.

At this time, as shown in FIG. 7A, reading position information of at least two points (eg, points Ma1 and Ma2) along the longitudinal direction of the cylindrical lenses 11 and connecting the two points. By using the linear function it is possible to obtain the positional information necessary for the alignment action between the optical sheet 10 and the display panel 30 by finding the positions and slopes. In order to increase the reading accuracy, it is also possible to read the three or more points, obtain a function by using least squares for the three points, and find the position and slope by using this function. Although two points (points Ma1 and Ma2) are located at the end (right end in FIG. 7A) far from the lens pitch direction of the optical sheet 10 for convenience, the points are not limited to being only at these positions. Points at locations that are on the inside of the far end may also be used.

7B shows a schematic view when the non-optical element face (non-lens face) of the optical sheet 10 and the sheet holding head 20 are in contact. In this case, the distribution according to the lens image forming performance is obtained in the image captured by the reflected light.

As the light source 43, various light sources such as LED light, fluorescent light, and the like can be used, and the wavelength can be arbitrarily set according to the spectral sensitivity of the CCD in the camera 44. This is the same as in the light source 53.

As shown in FIG. 1A, techniques such as vacuum absorption, electrostatic absorption, and adhesion may be used to pick up the optical sheet 10 by using the sheet holding head 20. Since the first exemplary embodiment is configured to read the positional information of the cylindrical lens 11 by using the reflected light 42, there is no limitation set on the material of the sheet holding head 20. For example, in the case where vacuum absorption is used, it is possible to use a material excellent in forming absorption holes, a porous material, a low surface-stiffness material or the like which suppresses damage to the optical sheet 10, and the like. . In the case where adhesion is used, it is possible to use elastomers made of rubber or artificial resin. In any case, it is not necessary to use a material that exhibits light transmitting properties. Thus, a lower cost and higher function seat holding head 20 can be used as compared to the case of using transmitted light.

In particular, the sheet holding head 20 whose holding surface 21, which is the surface to be in contact with the optical sheet 10, is covered by the elastomer can be a lens pickup utilizing the adhesiveness of the elastomer, and the optical sheet 10 and the display Techniques for laminating panel 30 are preferred. Lamination using an adhesive elastomer can equalize the pressure applied to the optical sheet 10 upon lamination over the entire sheet surface because of the elasticity of the elastomer. It also has the effect of suppressing deformation of the cylindrical lenses that may be caused by the applied pressure.

At this time, the optical sheet 10 cannot be held when the adhesiveness of the elastomer is too weak, while the optical sheet 10 cannot be released from the elastomer when the adhesiveness is too strong. Therefore, it is necessary to use an elastomer whose adhesiveness is within an appropriate range for holding the optical sheet 10. Since the degree of adhesion also depends largely on the dimensions of the contact areas between the optical element and the elastomer, the adhesion according to the dimensions of the contact areas is required. For example, when the contact region 14 is in point contact as in the case of a fly-eye lens sheet or prism sheet, an elastomer having an adhesive in the range of 1.0 N / 20 mm to 500 N / 20 mm is used. It is preferable. When the contact region 14 is in linear contact as in the case of the lenticular lens sheet, it is preferable to use an elastomer having adhesiveness in the range of 0.1 N / 20 mm to 100 N / 20 mm.

In addition, air bubbles are formed in the contact surface between the optical sheet 10 and the display panel 30 when the pressure is too small during lamination, while deformation and damage or display panel of the optical sheet 10 when the pressure is too large. Damage of 30 is generated. Therefore, it is also necessary to carry out lamination within an appropriate range with respect to the applied pressure. Since the magnitude of the applied pressure also depends largely on the strength of the optical sheet 10 and the display panel 30, the applied pressure is required according to the strength. For example, when a lenticular lens made of 0.2 mm thick plastic is laminated on a liquid crystal display panel having a total thickness of 1.0 mm, the applied pressure is preferably set in the range of 0.01 MPa to 1.0 MPa.

8A, in the step of reading the positional information of the optical sheet 10 held by the sheet holding head 20, the positional information of the plurality of cylindrical lenses 11 in the optical sheet 10 is obtained. A plurality of cameras 44a and 44b (a plurality of light sources 43a and 43b as required) are provided in the lens pitch direction for more accurate reading. The reason for doing so is that the accuracy of the linear function described above can be improved, and the pitch accuracy from the distance in the pitch direction is not only the position information of the single cylindrical lens 11 but also the position information of the plurality of cylindrical lenses 11. This can be calculated by using As shown in FIG. 1B, when the same effect is achieved by a single camera 44, the camera 44 or seat holding head 20 is read to read the positions of the plurality of cylindrical lenses 11. You need to move it. On the other hand, since it is not necessary to move the camera or the seat holding head using the plurality of cameras 44a and 44b, the laminating step can be shortened. Also, when a plurality of cameras 44a and 44b are provided, it is preferable to read as much as possible the positional information of the two cylindrical lenses 11 located at both ends in the lens pitch direction. This is because the accuracy of the variation amount of the read lens pitch can be improved as more isolated intervals in the pitch direction become larger.

By reading the positional information of the optical sheet 10 shown in FIG. 1B and simultaneously reading the positional information of the panel mark 31 shown in FIG. 1C, the time for the laminating step can be shortened. When performing the lamination shown in FIG. 1D, the sheet holding head 20 with respect to the display panel 30 as shown in FIG. 8B so that no air bubble is formed between the optical sheet 10 and the display panel 30. It is preferable to perform lamination by tilting.

As an adhesive material for laminating the optical sheet 10 and the display panel 30, a thermosetting resin adhesive, an ultraviolet (ultraviolet) curable adhesive, a visible light curable adhesive, or the like can be used. However, preference is given to using UV curable adhesives or visible light curable adhesives with a small thermal load. In addition, besides the adhesive, a double-sided transparent adhesive film having an adhesive may be used. The double sided transparent adhesive film has the advantage of no thermal load and no adhesive forced out from the lens end face.

In the case shown in FIG. 8C, a sheet holding head 20 is provided on the lower side of the display panel 30. Even in this state, it is possible to laminate the optical sheet 10 and the display panel 30 as in the case of FIG.

As an exemplary advantage according to the present invention, the present invention makes it possible to overcome various issues when using transmitted light in one effort through using reflected light rather than transmitted light to read the positional information of the optical sheet. Therefore, the reading accuracy of the positional information of the optical sheet can be improved. Thus, it is possible to achieve high accuracy and improve yield in the optical sheet laminating step.

(2nd exemplary embodiment)

9 shows a seat holding head according to the second exemplary embodiment, where FIG. 9A is a perspective view and FIGS. 9B and 9C are schematic diagrams showing a position information reading action. Hereinafter, explanations will be provided by referring to FIG. 9.

It is a characteristic of the second exemplary embodiment that the holding face 21a of the seat holding head 20a is curved. 9A shows an example of the holding surface 21a of the curved shape. In the sheet holding head 20a, the holding face 21a for holding the optical sheet 10 is arc shaped with curvature. It is desirable to provide a plurality of cameras 44a and 44b (and light sources 43a and 43b as needed).

The shape of the holding face 21a of the sheet holding head 20 in the second exemplary embodiment is arcuate, but any other shapes can be used as long as the face holding the optical sheet 10 is a curved face. However, when the arc shape is used, the curvature in the radial direction becomes constant regardless of the rotation angle. Thus, the arc shape has the advantage of facilitating setting camera positions, controlling readings, setting a rotation axis for lamination, controlling lamination, and the like, for reading the positional information of the lenticular lens sheet described below. .

As shown in FIGS. 9B and 9C, the rotation of the sheet holding head 20a having the arc-shaped holding surface 21a without moving the camera 44 is used to adjust the optical sheet 10 according to the rotation angle. It is possible to obtain a plurality of pieces of location information. In addition, in the second exemplary embodiment, a rotary mechanism 77 is provided between the seat holding head 20a and the head stage 73 (FIG. 3). The rotary mechanism 77 is formed by a motor, a reduction gear, etc., for example, and rotates the seat holding head 20a about the rotation axis 78. The rotary mechanism 77 also operates in accordance with instructions from the control unit 80 (FIG. 4) such as the head stage 73 (FIG. 3) and the like.

10 is a schematic diagram illustrating laminating steps according to the second exemplary embodiment, wherein the steps proceed in the order of FIGS. 10A, 10B, and 10C. Descriptions are provided below by referring to FIG. 10.

As shown in FIG. 10, the optical sheet 10 held by using the sheet holding head 20a is in contact with the display panel 30, and the rotation axis 78 of the sheet holding head 20a is rotated, The display panel 30 or the rotation axis 78 itself is relatively moved by moving simultaneously with the rotary action. By this, the optical sheet 10 can be laminated on the display panel 30 continuously from the end of the optical sheet 10 toward the end on the opposite side.

At this time, as shown in FIG. 10A, the optical sheet 10 is partially held away from the display panel 30 so that the sheet holding head 20a does not come into contact before being rotated, and the sheet holding as shown in FIG. 10B. It is preferable to start laminating the optical sheet 10 by rotating the head 20a. If the optical sheet 10 and the display panel 30 are contacted before rotating the sheet holding head 20a, laminating the contact surface due to the deviation caused by a slight difference in the pressures applied before and after the rotation. Air bubbles may be formed in the adhesive used for the purpose. Also, at the end of the laminating action, the sheet holding head 20a may be completely separated from the optical sheet 10 as shown in FIG. 10C after the optical sheet 10 and the display panel 30 have been laminated through the entire surface. It is preferable to rotate the sheet holding head 20a until it is. This also has the effect of reducing the formation of air bubbles as in the case of the start of the laminating action.

FIG. 11 shows a perspective view of a part of the laminating step according to the second exemplary embodiment, where FIG. 11A is where the contact area between the sheet holding head and the optical sheet is parallel to the arc tangent direction of the sheet holding head, and FIG. 11B Is the case where the contact area between the sheet holding head and the optical sheet is perpendicular to the arc tangent direction of the sheet holding head. Descriptions will be provided below with reference to FIGS. 10 and 11.

When holding the optical sheet 10 using the sheet holding head 20a, it is preferable to set so that the lens pitch length direction and the arc direction tangent direction are parallel. In that case, when laminating the optical sheet 10 and the display panel 30 as shown in FIG. 11A, there are always contact regions 14 between the sheet holding head 20a and the optical sheet 10. . Thus, the lens holding force is stabilized. On the other hand, when the lens pitch length direction and the tangent direction are perpendicular as shown in FIG. 11B, the contact regions 14 between the sheet holding head 20a and the optical sheet 10 are the optical sheet 10 and the display panel. It becomes perpendicular to the arc tangent direction (ie, laminating direction) when laminating 30. When the sheet holding head 20a is rotated during lamination, regions in which there are no contact regions 14 between the optical sheet 10 and the sheet holding head 20a are created according to the period of the lens pitches. Thus, the applied pressure becomes nonuniform, which may lead to air bubble formation. In addition, stress concentration acts on the gauge section of the cylindrical lens 11, which in the worst case may lead to crack generation in the cylindrical lens 11.

Using the second exemplary embodiment, linear air bubbles between the optical sheet 10 and the display panel 30 can be greatly facilitated through laminating them by using the sheet holding head 20a. Since the sheet holding head 20a holds the optical sheet 10 in a wrapped state, it is impossible to use a laminating method of overlapping the panel marks 31 of the display panel 31. Therefore, it is very important to separately capture the image of the positional information of the optical sheet 10 and the positional information of the panel mark 31 of the present invention.

The holding force due to the strength of the optical sheet 10 deteriorates when the radial curvature of the sheet holding head 20a is too small, while the effect of lowering the linear air bubble decreases when the radial curvature of the sheet holding head is too large. do. Therefore, the radius of curvature of the sheet holding head 20a is preferably in the range of 50 mm to 500 mm. However, considering the distance from the rotation axis 78 to the tip of the seat holding head 20a as a factor for determining the height of the laminating device, it is more preferable that the radial curvature is in the range of 50 mm to 200 mm. Do.

12 is a schematic diagram showing the case where the seat holding head 20a is provided on the lower side of the display panel 30. Even in this state, it is possible to laminate the optical sheet 10 and the display panel 30 as in the above description.

(Third Exemplary Embodiment)

The third exemplary embodiment shows an example of a laminating method for reading the pitch accuracy of at least two regions of the optical sheet held in an arc-shaped holding head and correcting the pitch accuracy according to the reading result.

FIG. 13 is a graph showing an example of the relationship between the laminating pressure and the amount of lens pitch variation before and after lamination when the method described in the second exemplary embodiment is used. In this example, laminating pressure and lens pitch variation are almost linear relations. However, the relationship between laminating pressure and lens pitch variation also depends on mechanical specifications such as the thickness of the lenticular lens sheet, the elastic modulus, the structure of the sheet holding head, the laminating method of the material, and the like. Thus, for example, this relationship is known in advance as shown in the graph shown in FIG. Hereinafter, the lens pitch variation amount is expressed as "ΔL".

First, before the lenticular lens sheet lamination step, the position information of the lenticular lens sheet held by the seat holding head, that is, the lens at the part (AA part) corresponding to the start of lamination at the end of the lens longitudinal direction as shown in Fig. 14A. The lens pitch L2 at the part (BB part) corresponding to the end of the lamination at the pitch L1 and the other end is read. Then, the difference between L1 and L2, that is, ΔL1 = L1-L0, ΔL2 = L2-L0, is obtained with respect to the original lens pitch L0. It is assumed here that DELTA L1 = -20 ppm and DELTA L2 = -60 ppm. Subsequently, referring to FIG. 14B, the laminating pressure is set according to the rotation angle of the seat holding head in such a manner that P1 becomes the laminating pressure necessary to calibrate 0 ppm and P2 becomes the laminating pressure necessary to calibrate 60 ppm. . Then, as shown in Fig. 14C, the laminating pressure according to the setting is applied from the AA point to the BB point to make the lens pitch after lamination.

The lens pitch read point is not limited to two points, such as lamination start and lamination end, but may be three points or more. In particular, in the example shown in Fig. 15A where the lens pitch is nonuniform, the CC point may be read in the middle of the lens longitudinal direction. This makes it possible to perform the applied pressure control by having the CC point as shown in Fig. 15B as the reflection point, so that the effect of correcting the lens pitches can be further improved. As described in the first exemplary embodiment, it is of course possible to perform pitch correction by using a function according to least squares method (FIG. 15C).

As a method of changing the applied pressure, it is preferable to set the pressure by changing the push-in amount of the seat holding head (for example, in the structure of FIG. 3, the head stage (in the Z-axis direction) 73) using movement by). In this case, the relationship between the pressure acting on the panel and the amount of push-in varies depending on the methods such as the above-described adhesive and absorption and the material constituting the seat holding head. Therefore, it is desirable to grasp this relationship in advance. It is also possible to use pressure variable devices such as air pressure cylinders. However, since the pressure adjustment is sometimes delayed for the laminating speed using the pressure variable device, simple pressure control can be easily done with the use of the push-in variation.

Using the third exemplary embodiment, lenticular lens sheets with non-uniform lens pitch can be laminated with high accuracy. Thus, the third exemplary embodiment can not only provide a very accurate laminating method but also contribute to lowering the cost by improving the yield since the pitch tolerance is increased during lens manufacturing.

(Fourth Exemplary Embodiment)

The fourth exemplary embodiment shows an example of the pitch accuracy reading method at a specific position of the lenticular lens sheet held by the sheet holding head.

16B shows an example of the optical sheet (lenticular lens sheet) 10a used in the fourth exemplary embodiment. At the end along the lens pitch direction, at least a single non-periodic section 15 in which the periods of the cylindrical lens 11 vary is provided as a mark for reading the positional information of the optical sheet 10a. That is, regions in which the period of the cylindrical lenses 11 vary (two non-periodic sections 15) are provided at at least both ends of the optical sheet 10a. 16A shows an example of an image obtained by irradiating light to the contact areas 14 between the optical sheet 10a and the sheet holding head 20 and capturing the reflected light. First in the third exemplary embodiment, the contact area 14 of any cylindrical lens 11 is read. On the other hand, in the fourth exemplary embodiment, the pitch of the specific position of the optical sheet 10a can be read using specific positions, that is, non-periodic sections 15. In the fourth exemplary embodiment, the cross section of the non-periodic section 15 may be of any shape and needs to be flat as long as it is lower than the height of the cylindrical lens 11 in order to read the contact area 14. May not be present.

In addition, as a modification, FIG. 17A shows an example of the optical sheet (lenticular lens sheet) 10b. As a mark for reading the positional information of the optical sheet 10a, at least a single notch 16 is provided at the corner of the optical sheet 10b. 17B shows an example of an image obtained by irradiating light to the contact area 14 between the optical sheet 10b and the sheet holding head 20 and capturing the reflected light. At the corner of the cylindrical lens 11, the notch 16 is provided as a mark for reading the positional information of the optical sheet 10b. This makes it possible to read the pitch at a specific position of the optical sheet 10b.

In the description of FIG. 7 relating to the first exemplary embodiment, two points Ma1 and Ma2 of the cylindrical lens 11 are shown as not necessarily at the far end of the optical sheet 10. This is because in some cases the contact area 14 between the optical sheet 10 and the sheet holding head may be in the state shown in FIG. 18B. As shown in FIG. 18A, when forming the outline of the lenticular lens sheet by the die-cutting process or the cutting process, some rotational shift may be generated in the cut line parallel to the longitudinal direction of the cylindrical lens 11. have. In particular, using a very fine lenticular lens having a pitch of 200 μm or less, there is a possibility of losing a prescribed number of lenses depending on the pitch. Thus, by predicting the lens missing part, an image of the contact area 14 of any cylindrical lens 11 in any pitch direction on the inner side rather than the far end is used.

However, since only the contact area following a repetition of a specific period appears in this image, it is difficult to specify the reading position with respect to the appearance of the lenticular lens sheet. Thus, more dummy cylindrical lenses are required than the number of lenses lost in the cutting. In this obscure reading state, a significant number of dummy lenses are required. As a result, the appearance of the lenticular lens sheet becomes considerably larger with respect to the display panel.

On the other hand, using the fourth exemplary embodiment, the specific position of the lenticular lens sheet is known. Thus, the appearance of the lenticular lens sheet is only slightly larger for the display panel, since only the number of dummy lenses lost in the cutting is required. This contributes to narrowing the frame of the display device using the present method.

(Fifth Exemplary Embodiment)

19A is a perspective view showing a mobile terminal device 90, in which a display device 91 having an optical sheet laminated on a display panel is loaded by using the present invention on the mobile terminal device. As shown in FIG. 19A, display device 91 is loaded on a mobile terminal device 90, such as a mobile telephone.

In the fifth exemplary embodiment, the case of using the lenticular lens sheet is described first, but a fly-eye lens 17 (FIG. 19B), a prism sheet, or the like can also be used. The same effects as those of each of the exemplary embodiments can also be achieved when using these lenses.

Although the present invention has been described with reference to each of the exemplary embodiments, the present invention is not limited to each of these exemplary embodiments. Various changes and modifications made to those skilled in the art can be applied to the structure and details of the present invention. In addition, the present invention includes suitable combinations of one or all portions of the structures of each of these exemplary embodiments.

Next, the present invention is summarized. The film laminating method according to the present invention is an optical sheet laminating method for laminating an optical sheet having a plurality of optical elements formed thereon by using a sheet holding head in a display panel in which a plurality of electro-optical elements are formed thereon, The method comprises: bringing the optical element face of the optical sheet into contact with the sheet holding head, irradiating light from the non-optical element face of the optical sheet to the contact area, and using the first imaging device according to the distribution of the reflected light. A first reading step of reading the contact area between the element and the sheet holding head; Aligning the position of the optical sheet and the position of the display panel according to the first reading step, and moving the sheet holding head to the defined position; And laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel after bringing the optical sheet into contact with the display panel. With this structure, the positional information of the optical sheet is read by using the reflected light. Thus, the sheet holding head does not need to have light transmitting properties, and therefore there is no limitation in the material setting of the head. For example, in the case of a three-dimensional display device in which a lenticular lens sheet is laminated, the positional relationship between the vertices of the lens surface of the lenticular lens sheet and the pixels of the display panel is important. As in the present invention, through reading the contact areas between the optical sheet and the sheet holding head, the vertex areas of the lens surface can be recognized safely. Thus, the accuracy of reading the optical sheet position information necessary for laminating the optical sheet can be improved. In addition, even when there are large changes in the radial curvature of the respective lenses or when there is distortion generated in the lens film itself, the reading accuracy is improved because the vertex regions of the lens faces of the lenticular lens sheet still contact the sheet holding head. It doesn't get worse.

The film laminating method according to the present invention is an optical sheet laminating method for laminating an optical sheet having a plurality of optical elements formed thereon by using a sheet holding head in a display panel in which a plurality of electro-optical elements are formed thereon, The method comprises: bringing the non-optical element face of the optical sheet into contact with the sheet holding head, irradiating light from the optical element face of the optical sheet to the contact area, and using the first imaging device according to the distribution of the reflected light. A first reading step of reading the contact area between the element and the sheet holding head; An alignment step of aligning the position of the optical sheet and the position of the display panel according to the first reading step and moving the sheet holding head to the defined position; And laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel after bringing the optical sheet into contact with the display panel.

The optical element may be a cylindrical lens which is a convex lens having a cylindrical surface, and the optical sheet may be a lenticular lens sheet film in which a plurality of cylindrical lenses are arranged at the same lens pitch. Further, the optical element may be a fly-eye lens, which is a block lens having a cylindrical surface, wherein the optical sheet is arranged with a plurality of plies arranged in individual lens pitches in a first direction and in a second direction perpendicular to the first direction. It may be a fly-eye lens film with eye lenses.

The sheet holding head may be arc-shaped with curvature, and the surface holding the optical sheet may be a curved surface. Through lamination by using an arc-shaped sheet holding head, linear air bubbles formed between the optical sheet and the display panel can be suppressed. At this time, the direction of relative motion for laminating the lenticular lens sheet may be parallel by using the lens longitudinal direction of the lenticular lens sheet film and the sheet holding head. Further, the tangent direction of the arc of the arc-type sheet holding head may be parallel to the lens length direction of the lenticular lens sheet film and the direction of relative motion for laminating the lenticular lens sheet film by using the arc-type sheet holding head. .

In the contact surface between the lenticular lens sheet and the seat holding head, the lens vertices and the seat holding head of the cylindrical lenses constituting the lenticular lens sheet are in linear contact in a periodically lined state. FIG. 11 shows an example of the contact area 14 between the arc-shaped sheet holding head 20a and the lenticular lens sheet. When the lens longitudinal direction and the laminating direction are parallel (FIG. 11A), since the contact areas always exist during lamination, lamination can be performed with a stable holding force. When the lens longitudinal direction and the laminating direction are perpendicular (FIG. 11B), there are periodically sections in which the lenticular lens sheet and the sheet holding head do not contact during lamination. Thus, a stable holding force cannot be obtained, and air bubbles may be mixed in the same case.

In the step of laminating the optical sheet and the display panel, the laminating pressure applied to the sheet holding head may not be constant in the middle of the relative motion performed during lamination. Further, in the first reading step of reading the contact area between the optical element and the sheet holding head, the laminating pressure applied to the sheet holding head in the laminating optical sheet and the display panel is shifted from the designed value of the lens pitch of the lens film. After calculating the amount, it may be set based on the result of the calculation. The laminating pressure applied to the seat holding head may be set by the amount of push-in of the seat holding head to the display panel. In these cases, even if the lens pitch of the lenticular lens sheet is varied at the stage before lamination, it is possible to change it to an appropriate lens pitch after lamination by adjusting the laminating pressure.

As a film mark, periods of optical element variation may be present at at least one side or both ends of one direction of the optical sheet. In addition, a notch may be provided in at least one of the corners of the optical sheet. In these cases, a plurality of feature areas can be provided in the contact area between the optical sheet and the sheet holding head through providing sections with different periods in some of the optical sheet.

At least two or more imaging cameras constituting the first imaging device of the present invention may be provided, and at least two or more videos may be obtained when executing the first reading step for use of the videos in the aligning step. In order to read the positional information of the optical sheet, it is necessary to obtain positional information of at least two points or more. Through providing two or more devices for acquiring positional information of the optical sheet, necessary positional information can be obtained by a single film.

The sheet holding head of the present invention may hold the optical sheet through the entire surface including the contact area used in the first reading step. The surface of the sheet holding head may be covered by an adhesive elastomer, and the optical sheet may be held by the adhesive force of the elastomer. By providing an elastic adhesive elastomer on the surface of the seat holding head, the pressure can be made uniform during lamination. In addition, deformation of the lenticular lens during lamination can be lowered.

The film laminating method according to the invention is directed to a display panel having a panel mark for aligning the position, the method comprising: a second reading of the panel mark of the display panel for aligning the position by using a second imaging device; step; An alignment step of aligning the position of the optical sheet and the position of the display panel according to the first reading step and the second reading step and moving the sheet holding head to the defined position; And laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel after bringing the optical sheet into contact with the display panel. By reading the positional information of the display panel and the positional information of the optical sheet by separate devices, there is no restriction set on the positions of the panel mark. For example, in the liquid crystal display device as shown in FIG. 20, the panel mark 31 can be located near the frame of the display panel 30 far from the optical sheet 10, so that the effects imposed on the display quality are Can be reduced.

Next, the effects of the present invention will be described. By using the present invention, the reading accuracy of the optical sheet is improved. Thus, it is possible to use the present invention to provide a highly accurate optical sheet laminating step and to improve the yield of the laminating step. Even if the optical element pitch of the optical sheet fluctuates unevenly, it is possible to improve the yield of the laminating step by providing a highly accurate optical sheet laminating step and performing the lamination to have a suitable optical element pitch. Since formation of air bubbles and linear air bubbles between the optical sheet and the display panel can be prevented, the yield of the optical sheet laminating step can be improved. In the case where the lenticular lens sheet is used as the optical sheet, a highly accurate and low load lamination step can be provided through using the sheet holding method and the laminating direction by considering the lens pitch direction. Since there are no restrictions set on the positions of the panel mark required for very accurate lamination, the display quality can be improved.

Some or all of the example embodiments may appear as follows. However, the present invention is not limited only to the structures described below.

(Supplementary Note 1)

By using the sheet holding head an optical sheet having two sides composed of an optical element face on which the plurality of optical elements are formed and a non-optical element face on which the optical elements are not formed and a display panel on which the plurality of electro-optic elements are formed An optical sheet laminating method of laminating, which method makes an optical element face contact with a sheet holding head, irradiates light from the non-optical element face to a contact area between the optical element face and the sheet holding head, and A first reading step of reading positions of the contact area by using the first imaging device according to the distribution; And an alignment step of aligning the position of the optical sheet and the position of the display panel based on the positions of the contact area read in the first reading step.

(Supplementary Note 2)

By using the sheet holding head an optical sheet having two sides composed of an optical element face on which the plurality of optical elements are formed and a non-optical element face on which the optical elements are not formed and a display panel on which the plurality of electro-optic elements are formed An optical sheet laminating method of laminating, which method brings a non-optical element face into contact with a sheet holding head, irradiates light from the optical element face to the contact area between the non-optical element face and the sheet holding head, and reflects A first reading step of reading the positions of the contact area by using the first imaging device according to the distributed light distribution; And an alignment step of aligning the position of the optical sheet and the position of the display panel based on the positions of the contact regions read in the first reading step.

(Supplementary Note 3)

An optical sheet having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which no optical elements are formed, and a panel mark for aligning positions and a plurality of electro-optical elements formed thereon. An optical sheet laminating method of laminating a display panel having a sheet holding head by using a sheet holding head, wherein the method makes the optical element face contact with the sheet holding head, and the contact between the optical element face and the sheet holding head from the non-optical element face. A first reading step of irradiating the area with light and reading positions of the contact areas through obtaining a distribution of reflected light by using the first imaging device; A second reading step of reading the position of the panel mark by using a second imaging device; Alignment to align the position of the optical sheet and the position of the display panel by moving the sheet holding head to a defined position based on the positions of the contact regions read in the first reading step and the position of the panel mark read in the second reading step step; And laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel while maintaining the contact of the optical sheet and the display panel.

(Supplementary Note 4)

An optical sheet having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which no optical elements are formed, and a panel mark for aligning positions and a plurality of electro-optical elements formed thereon. An optical sheet laminating method of laminating a display panel having a sheet holding head by using a sheet holding head, which method brings a non-optical element face into contact with the sheet holding head and between the non-optical element face and the sheet holding head from the optical element face. A first reading step of irradiating light on a contact area of the device and reading positions of the contact areas through obtaining a distribution of reflected light by using the first imaging device; A second reading step of reading the position of the panel mark of the display panel by using the second imaging device; Alignment to align the position of the optical sheet and the position of the display panel by moving the sheet holding head to a defined position based on the positions of the contact regions read in the first reading step and the position of the panel mark read in the second reading step step; And laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel while maintaining the contact of the optical sheet and the display panel.

(Supplementary Note 5)

The optical sheet laminating method shown in Supplementary Note 3 or 4, wherein the optical element is a cylindrical lens formed by a convex lens having a cylindrical surface; The optical sheet is a lenticular lens sheet film in which a plurality of cylindrical lenses are arranged at defined lens pitches.

(Supplementary Note 6)

The optical sheet laminating method shown in Supplemental Note 3 or 4, wherein the optical element is a fly-eye lens formed by a convex lens having a cylindrical surface; The optical sheet is a fly-eye lens film having a lens surface on which a plurality of fly-eye lenses are disposed at respective lens pitches in a first direction and a first direction perpendicular to each other.

(Supplementary Note 7)

In the optical sheet laminating method shown in Supplemental Note 5, the surface of the sheet holding head for holding the optical sheet is a curved surface (with defined bends) in an arc shape.

(Supplementary Note 8)

As the optical sheet laminating method shown in Supplementary Note 7, the direction of the tangent of the arc is parallel to the lens length direction of the lenticular lens sheet film.

(Supplementary Note 9)

In the optical sheet laminating method shown in Supplemental Note 8, in the laminating step, the direction of relative motion is parallel to the lens length direction of the lenticular lens sheet film.

(Supplementary Note 10)

With the optical sheet laminating method shown in Supplemental Note 9, the pressure applied to the optical sheet is changed in the middle of the relative motion when the sheet holding head and the display panel are moved relatively in the laminating step.

(Supplementary Note 11)

In the optical sheet laminating method shown in Supplementary Note 10, in the laminating step, the shift amount from the designed value of the pitch is determined based on the positions of the contact regions read in the first reading step, and the pressure applied to the optical sheet is equal to the shift amount. It is set in such a way that it becomes smaller.

(Supplementary Note 12)

In the optical sheet laminating method shown in Supplemental Note 11, in the laminating step, the pressure applied to the optical sheet is set by the amount of push-in of the sheet holding head to the display panel.

(Supplementary Note 13)

In the optical sheet laminating method shown in any one of Supplementary Notes 1 to 12, sections having different periods of the optical element are provided as film marks on at least one side of the optical sheet.

(Supplementary Note 14)

In the optical sheet laminating method shown in any one of Supplementary Notes 1 to 12, sections having different periods of the optical elements are provided as film marks on both ends of at least one direction of the optical sheet.

(Supplementary Note 15)

In the optical sheet laminating method shown in any one of Supplementary Notes 1 to 12, a notch is provided in at least one of the corners of the optical sheet.

(Supplementary Note 16)

An optical sheet laminating method as set forth in any one of Supplementary Notes 1 to 15, comprising: at least two or more imaging cameras constituting the first imaging device to obtain at least two or more videos when executing the first reading step; These videos are used in the alignment step.

(Supplementary Note 17)

With the optical sheet laminating method shown in any one of Supplementary Notes 1 to 16, the sheet holding head holds the optical sheet over the entire area including the contact area used in the first reading step.

(Supplementary Note 18)

An optical sheet laminating method as described in any one of Supplementary Notes 1 to 17, wherein the surface of the sheet holding head is covered by an adhesive elastomer; The optical sheet is held by using the adhesive force of the elastomer.

(Supplementary Note 19)

As the optical sheet laminating method shown in any one of Supplementary Notes 1 to 18, the display panel is a liquid crystal display panel.

(Supplementary Note 20)

An optical sheet laminating device using the optical sheet laminating method shown in any one of Supplementary Notes 1 to 19.

(Supplementary Note 21)

Display device manufactured by the optical sheet laminating method shown in any one of Supplementary Notes 1 to 19.

(Supplementary Note 22)

An optical sheet laminating method for laminating an optical sheet and display panel having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which the optical elements are not formed by using a sheet holding head, comprising: The method comprises: bringing either the optical element face or the non-optical element face into contact with the sheet holding head; Irradiating light from the other of the optical element face and the non-optical element face to the contact areas between the sheet holding head and either the optical element face or the non-optical element face; Reading position information of the contact regions from the reflected light distribution; And aligning the position of the optical sheet and the position of the display panel based on the position information of the contact regions and laminating the optical sheet and the display panel.

(Supplementary Note 23)

An optical sheet laminating method shown in Supplemental Note 22, the method comprising: reading position information of a panel mark added to a display panel; Aligning the position of the optical sheet and the position of the display panel based on the position information of the contact regions and the position information of the panel mark; And laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel while maintaining the contact of the optical sheet and the display panel.

(Supplementary note 24)

The optical sheet laminating method shown in Supplemental Note 22 or 23, wherein the optical element is a cylindrical lens formed by convex lenses having a cylindrical surface; The optical sheet is a lenticular lens sheet in which a plurality of cylindrical lenses are arranged at a defined lens pitch.

(Supplementary Note 25)

The optical sheet laminating method shown in Supplemental Note 22 or 23, wherein the optical element is a fly-eye lens formed by convex lenses having a cylindrical surface; The optical sheet is a fly-eye lens film having a lens surface on which a plurality of fly-eye lenses are disposed at respective lens pitches in a first direction and a second direction perpendicular to each other.

(Supplementary Note 26)

In the optical sheet laminating method shown in Supplemental Note 24, the surface of the sheet holding head for holding the optical sheet is an arc-shaped curved surface.

(Supplementary Note 27)

As the optical sheet laminating method shown in Supplementary Note 26, the direction of the tangent of the arc is parallel to the lens length direction of the lenticular lens sheet film.

(Supplementary Note 28)

As the optical sheet laminating method shown in Supplementary Note 27, the direction of relative motion is parallel to the lens length direction of the lenticular lens sheet film.

(Supplementary Note 29)

An optical sheet laminating method as shown in Supplemental Note 28, comprising changing the pressure applied to the optical sheet when moving the display panel and the sheet holding head relatively in the middle of relative motion.

(Supplementary Note 30)

An optical sheet laminating method as shown in Supplemental Note 29, comprising: obtaining a shift amount from a designed value of a pitch based on positional information of contact regions; And setting the pressure applied to the optical sheet in such a manner that the shift amount becomes small.

(Supplementary Note 31)

In the optical sheet laminating method shown in Supplemental Note 30, the pressure applied to the optical sheet is set by the amount of push-in of the sheet holding head relative to the display panel.

(Supplementary Note 32)

In the optical sheet laminating method shown in any one of Supplementary Notes 24 to 31, a section having different periods of optical elements is provided on at least one side of the optical sheet.

(Supplementary Note 33)

In the optical sheet laminating method shown in any one of Supplementary Notes 22 to 31, sections having different periods of optical elements are provided on both ends in at least one direction of the optical sheet.

(Supplementary Note 34)

An optical sheet laminating method as described in any one of Supplementary Notes 22 to 31, wherein a notch is provided at at least one of the corners of the optical sheet.

(Supplementary Note 35)

In the optical sheet laminating method shown in any one of Supplementary Notes 22 to 34, a plurality of images of a distribution of reflected light are obtained by a plurality of cameras for reading position information of contact regions.

(Supplementary Note 36)

With the optical sheet laminating method shown in any one of supplementary notes 22 to 35, the sheet holding head holds the optical sheet over the entire area including the contact areas.

(Supplementary Note 37)

The optical sheet laminating method as set forth in any one of Supplementary Notes 22 to 36, wherein the surface of the sheet holding head is covered by an adhesive elastomer; The optical sheet is held by using the adhesive force of the elastomer.

(Supplementary Note 38)

As the optical sheet laminating method shown in Supplementary Notes 22 to 37, the display panel is a liquid crystal display panel.

(Supplementary Note 39)

An optical sheet laminating device for laminating a display panel and an optical sheet having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which the optical elements are not formed, the device comprising: an optical element face Or a sheet holding head holding the optical sheet by bringing it into contact with any of the non-optical element faces; A first imaging that irradiates light from either the optical element face or the other of the non-optical element face into a contact area between either the optical element or the non-optical element and the sheet holding head, and obtains an image of the distribution of the reflected light part; A second imaging unit which acquires an image of a panel mark added to the display panel; A moving mechanism unit for moving at least one of the optical sheet and the display panel in the coordinate space; And reading the position information of the contact area from the image acquired by the first imaging unit and the position information of the panel mark from the image acquired by the second imaging unit, and based on the position information of the contact area and the position information of the panel mark. And a control unit that controls the movement mechanism unit to align the positions of the optical sheet and the display panel and to laminate the optical sheet and the display panel.

(Supplementary note 40)

A display device comprising a display panel on which an optical sheet is laminated by the optical sheet laminating method shown in any one of Supplementary Notes 22 to 38.

(Supplementary Note 41)

Computer reading comprising a program used in an optical sheet laminating device for laminating a display panel and an optical sheet having two sides composed of an optical element surface on which a plurality of optical elements are formed and a non-optical element surface on which the optical elements are not formed A possible medium, the device comprising: a sheet holding head for holding an optical sheet by bringing it into contact with either an optical element face or a non-optical element face; Irradiating light from the optical element face or the other of the non-optical element face into the contact area between the optical element face or the non-optical element face and the sheet holding head, and obtaining an image of the distribution of the reflected light. 1 imaging unit; A second imaging unit which acquires an image of a panel mark added to the display panel; A movement mechanism unit for moving at least one of the display panel and the optical sheet in the coordinate space; And a control unit including a computer. The program includes a procedure for causing a computer to read the positional information of the contact area from the image acquired by the first imaging section; A procedure for reading the positional information of the panel mark from the image acquired by the second imaging unit; And controlling the moving mechanism unit based on the positional information of the contact regions and the positional information of the panel mark, thereby aligning the position of the optical sheet and the position of the display panel and executing a procedure for laminating the display panel and the optical sheet.

The invention can be used, for example, for display devices capable of stereoscopic image display, viewing angle control, and the like, and for manufacturing methods thereof.

Claims (20)

An optical sheet laminating method of laminating an optical sheet and display panel having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which the optical elements are not formed by using a sheet holding head,
Bringing either the optical element face or the non-optical element face into contact with the sheet holding head;
Irradiating light from the other of the optical element face and the non-optical element face to contact areas between either the optical element face or the non-optical element face and the seat holding head;
Reading positional information of the contact regions from the reflected light distribution; And
And aligning the position of the optical sheet and the position of the display panel based on the positional information of the contact regions, and laminating the optical sheet and the display panel. The method of claim 1,
Reading position information of panel marks added to the display panel;
Aligning the position of the optical sheet and the position of the display panel based on the position information of the contact regions and the position information of the panel mark; And
Laminating the optical sheet and the display panel through relatively moving the sheet holding head and the display panel while maintaining contact of the optical sheet and the display panel. The method of claim 1,
The optical element is a cylindrical lens formed by a convex lens having a cylindrical surface;
And the optical sheet is a lenticular lens sheet film in which a plurality of cylindrical lenses are arranged at a defined lens pitch. The method of claim 1,
The optical element is a fly-eye lens formed by a convex lens having a cylindrical surface;
And the optical sheet is a fly-eye lens film having a lens surface in which a plurality of fly-eye lenses are disposed at respective lens pitches in a first direction and a second direction perpendicular to each other. The method of claim 3, wherein
The surface of the sheet holding head for holding the optical sheet is an arc-shaped curved surface. The method of claim 5, wherein
The tangent direction of the arc is parallel to the lens longitudinal direction of the lenticular lens sheet film. The method according to claim 6,
The direction of relative motion is parallel to the lens longitudinal direction of the lenticular lens sheet film. The method of claim 7, wherein
Varying the pressure applied to the optical sheet when relatively moving the sheet holding head and the display panel in the middle of the relative motion. The method of claim 8,
Obtaining a shift amount from a designed value of the pitch based on the positional information of the contact regions; And
Setting the pressure applied to the optical sheet in such a manner that the shift amount becomes small. The method of claim 9,
And said pressure applied to said optical sheet is set by the amount of push-in of said sheet holding head relative to said display panel. The method of claim 1,
And a section having different periods of the optical elements is provided on at least one side of the optical sheet. The method of claim 1,
And a section having different periods of the optical elements is provided on both ends in at least one direction of the optical sheet. The method of claim 1,
At least one of the corners of the optical sheet is provided with a notch. The method of claim 1,
And a plurality of images of the distribution of the reflected light are obtained by a plurality of cameras to read position information of the contact areas. The method of claim 1,
And the sheet holding head holds the optical sheet over the entire area including the contact areas. The method of claim 1,
The surface of the seat holding head is covered by an adhesive elastomer;
And the optical sheet is held by using the adhesive force of the elastomer. The method of claim 1,
And said display panel is a liquid crystal display panel. An optical sheet laminating device for laminating a display panel and an optical sheet having two sides composed of an optical element face on which a plurality of optical elements are formed and a non-optical element face on which no optical elements are formed,
A sheet holding head holding the optical sheet by contact with either the optical element surface or the non-optical element surface;
Irradiating light from the other of the optical element face and the non-optical element face to the contact areas between either the optical element face or the non-optical element face and the sheet holding head, and the distribution of the reflected light A first imaging unit for acquiring an image of the camera;
A second imaging unit which acquires an image of a panel mark added to the display panel;
A moving mechanism unit for moving at least one of the optical sheet and the display panel in a coordinate space; And
Read the positional information of the contact regions from the image acquired by the first imaging unit and the positional information of the panel mark from the image acquired by the second imaging unit; And a control unit for controlling the moving mechanism unit based on the positional information of the panel mark to align the position of the optical sheet and the position of the display panel and to laminate the optical sheet and the display panel. device. A display device comprising the display panel where the optical sheet is laminated by the optical sheet laminating method according to claim 1. Computer reading comprising a program used in an optical sheet laminating device for laminating a display panel and an optical sheet having two sides composed of an optical element surface on which a plurality of optical elements are formed and a non-optical element surface on which the optical elements are not formed As a possible medium,
The device comprising:
A sheet holding head holding the optical sheet by contact with either the optical element surface or the non-optical element surface;
Contacting areas between either the optical element face or the non-optical element face and the seat holding head irradiate light from the other of the optical element face or the non-optical element face, and the distribution of the reflected light A first imaging unit for acquiring an image of the camera;
A second imaging unit which acquires an image of a panel mark added to the display panel;
A moving mechanism unit for moving at least one of the optical sheet and the display panel in a coordinate space; And
A control unit comprising a computer,
The program causes the computer to:
A procedure for reading position information of the contact areas from the image acquired by the first imaging unit;
A procedure for reading positional information of the panel mark from the image acquired by the second imaging unit; And
A procedure for aligning the position of the optical sheet and the position of the display panel and laminating the optical sheet and the display panel by controlling the movement mechanism unit based on the position information of the contact regions and the position information of the panel mark. And a program for use in an optical sheet laminating device.

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